Seconding what Brian said, I would also be happy with this solution.

Right now, guix users on aarch64 simply aren't using guile 3 because they can't pull, so this one bug probably acts as a blocker to encountering other potential bugs.

So even though it's not satisfactory, getting aarch64 working again could result in more and varied bug reports for guile on that platform, so that there may eventually be enough information to find the actual root cause of the problem.